1 /* -*- Mode: C; tab-width: 4 -*- */
2 /* sphere --- a bunch of shaded spheres */
5 static const char sccsid[] = "@(#)sphere.c 5.00 2000/11/01 xlockmore";
9 * Copyright (c) 1988 by Sun Microsystems
11 * Permission to use, copy, modify, and distribute this software and its
12 * documentation for any purpose and without fee is hereby granted,
13 * provided that the above copyright notice appear in all copies and that
14 * both that copyright notice and this permission notice appear in
15 * supporting documentation.
17 * This file is provided AS IS with no warranties of any kind. The author
18 * shall have no liability with respect to the infringement of copyrights,
19 * trade secrets or any patents by this file or any part thereof. In no
20 * event will the author be liable for any lost revenue or profits or
21 * other special, indirect and consequential damages.
24 * 01-Nov-2000: Allocation checks
25 * 30-May-1997: <jwz@jwz.org> made it go vertically as well as horizontally.
26 * 27-May-1997: <jwz@jwz.org> turned into a standalone program.
27 * 02-Sep-1993: xlock version David Bagley <bagleyd@tux.org>
28 * 1988: Revised to use SunView canvas instead of gfxsw Sun Microsystems
29 * 1982: Orignal Algorithm Tom Duff Lucasfilm Ltd.
34 * **************************************************************************
35 * Copyright 1988 by Sun Microsystems, Inc. Mountain View, CA.
39 * Permission to use, copy, modify, and distribute this software and its
40 * documentation for any purpose and without fee is hereby granted, provided
41 * that the above copyright notice appear in all copies and that both that
42 * copyright notice and this permission notice appear in supporting
43 * documentation, and that the names of Sun or MIT not be used in advertising
44 * or publicity pertaining to distribution of the software without specific
45 * prior written permission. Sun and M.I.T. make no representations about the
46 * suitability of this software for any purpose. It is provided "as is"
47 * without any express or implied warranty.
49 * SUN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
51 * IN NO EVENT SHALL SUN BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
52 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
53 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
54 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
56 * ***************************************************************************
61 #define DEFAULTS "*delay: 20000 \n" \
65 "*fpsSolid: true \n" \
67 # define BRIGHT_COLORS
68 # define release_sphere 0
69 # define reshape_sphere 0
70 # define sphere_handle_event 0
71 # include "xlockmore.h" /* from the xscreensaver distribution */
72 #else /* !STANDALONE */
73 # include "xlock.h" /* from the xlockmore distribution */
74 #endif /* !STANDALONE */
78 ENTRYPOINT ModeSpecOpt sphere_opts =
79 {0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
82 ModStruct sphere_description =
83 {"sphere", "init_sphere", "draw_sphere", (char *) NULL,
84 "refresh_sphere", "init_sphere", "free_sphere", &sphere_opts,
85 5000, 1, 20, 0, 64, 1.0, "",
86 "Shows a bunch of shaded spheres", 0, NULL};
91 * (NX, NY, NZ) is the light source vector -- length should be 100
97 #define SQRT(a) ((int)sqrt((double)(a)))
102 int x0; /* x center */
103 int y0; /* y center */
107 int shadowx, shadowy;
112 static spherestruct *spheres = (spherestruct *) NULL;
115 init_sphere(ModeInfo * mi)
119 MI_INIT (mi, spheres);
120 sp = &spheres[MI_SCREEN(mi)];
122 if (sp->points != NULL) {
123 (void) free((void *) sp->points);
124 sp->points = (XPoint *) NULL;
126 sp->width = MAX(MI_WIDTH(mi), 4);
127 sp->height = MAX(MI_HEIGHT(mi), 4);
128 if ((sp->points = (XPoint *) malloc(MIN(sp->width, sp->height) *
129 sizeof (XPoint))) == NULL) {
137 sp->shadowx = (LRAND() & 1) ? 1 : -1;
138 sp->shadowy = (LRAND() & 1) ? 1 : -1;
142 draw_sphere(ModeInfo * mi)
144 Display *display = MI_DISPLAY(mi);
147 register int minx = 0, maxx = 0, miny = 0, maxy = 0, npts = 0;
152 sp = &spheres[MI_SCREEN(mi)];
153 if (sp->points == NULL)
156 MI_IS_DRAWN(mi) = True;
157 if ((sp->dirx && ABS(sp->x) >= sp->radius) ||
158 (sp->diry && ABS(sp->y) >= sp->radius)) {
159 sp->radius = NRAND(MIN(sp->width / 2, sp->height / 2) - 1) + 1;
162 sp->dirx = (int) (LRAND() & 1) * 2 - 1;
166 sp->diry = (int) (LRAND() & 1) * 2 - 1;
168 sp->x0 = NRAND(sp->width);
169 sp->y0 = NRAND(sp->height);
171 sp->x = -sp->radius * sp->dirx;
172 sp->y = -sp->radius * sp->diry;
174 if (MI_NPIXELS(mi) > 2)
175 sp->color = NRAND(MI_NPIXELS(mi));
178 if (sp->x0 + sp->x < 0)
180 } else if (sp->dirx == -1) {
181 if (sp->x0 + sp->x >= sp->width)
182 sp->x = sp->width - sp->x0 - 1;
185 if (sp->y0 + sp->y < 0)
187 } else if (sp->diry == -1) {
188 if (sp->y0 + sp->y >= sp->height)
189 sp->y = sp->height - sp->y0 - 1;
192 sp->maxy = SQRT(sp->radius * sp->radius - sp->x * sp->x);
194 if (sp->y0 - sp->maxy < 0)
199 sp->maxx = SQRT(sp->radius * sp->radius - sp->y * sp->y);
201 if (sp->x0 - sp->maxx < 0)
206 if (sp->y0 + sp->maxy >= sp->height)
207 maxy = sp->height - sp->y0;
210 if (sp->x0 + sp->maxx >= sp->width)
211 maxx = sp->width - sp->x0;
213 XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
216 XDrawLine(display, MI_WINDOW(mi), gc,
217 sp->x0 + sp->x, sp->y0 + miny, sp->x0 + sp->x, sp->y0 + maxy);
219 XDrawLine(display, MI_WINDOW(mi), gc,
220 sp->x0 + minx, sp->y0 + sp->y, sp->x0 + maxx, sp->y0 + sp->y);
222 if (MI_NPIXELS(mi) > 2)
223 XSetForeground(display, gc, MI_PIXEL(mi, sp->color));
225 XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
228 sqrd = sp->radius * sp->radius - sp->x * sp->x;
229 nd = NX * sp->shadowx * sp->x;
230 for (sp->y = miny; sp->y <= maxy; sp->y++)
231 if ((NRAND(sp->radius * NR)) <= nd + NY * sp->shadowy * sp->y +
232 NZ * SQRT(sqrd - sp->y * sp->y)) {
233 sp->points[npts].x = sp->x + sp->x0;
234 sp->points[npts].y = sp->y + sp->y0;
239 sqrd = sp->radius * sp->radius - sp->y * sp->y;
240 nd = NY * sp->shadowy * sp->y;
241 for (sp->x = minx; sp->x <= maxx; sp->x++)
242 if ((NRAND(sp->radius * NR)) <= NX * sp->shadowx * sp->x + nd +
243 NZ * SQRT(sqrd - sp->x * sp->x)) {
244 sp->points[npts].x = sp->x + sp->x0;
245 sp->points[npts].y = sp->y + sp->y0;
249 XDrawPoints(display, MI_WINDOW(mi), gc, sp->points, npts, CoordModeOrigin);
252 if (sp->x0 + sp->x >= sp->width)
254 } else if (sp->dirx == -1) {
256 if (sp->x0 + sp->x < 0)
261 if (sp->y0 + sp->y >= sp->height)
263 } else if (sp->diry == -1) {
265 if (sp->y0 + sp->y < 0)
271 free_sphere(ModeInfo * mi)
277 sp = &spheres[MI_SCREEN(mi)];
280 (void) free((void *) sp->points);
281 /* sp->points = NULL; */
287 refresh_sphere(ModeInfo * mi)
293 sp = &spheres[MI_SCREEN(mi)];
301 XSCREENSAVER_MODULE ("Sphere", sphere)
303 #endif /* MODE_sphere */